Same as another poster, found my problem at the bottom molding right at the door. The rivet closest to the door frame had been been cocked to one side by the installer and that allowed water to siphon through an incredibly small defect. Of course, I found it after months of stripping caulk off roof penetrations, e.g. skylight, vent, antenna, etc., door and windows. I was told long ago by a sheet metal worker that roof flashings can leak through microscopic defects so I was forewarned. Good luck!
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